OK... just by the size of the cards you are most likely using a 2gb card that is an SD, which is perfect for it is what this camera reads.
the 8GB card is probably an HDSD card. This is not read by this camera.
They look the same, except are labeled differently.
Here are the specs on your camera: http://www.imaging-resource.com/PRODS/TZ1/TZ1A.HTM
here are the specs on the cards: http://en.wikipedia.org/wiki/Secure_Digital
Note how the specs of the camera define the memory card to be used is an SD card.

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The LG620g works with microSD cards. Your 4GB card is actually a microSDHC card. While it fits into the slot, it's electronically incompatible and will not work in this phone. You need to use microSD cards, 2GB and smaller.

The box may say you can use a card up to 8GB but since it can only use SD cards (not SDHC), the box seems to be in conflict with reality. Besides, the camera is only a 4 megapixel camera so you will be able to take hundreds of pictures with a 2GB card.

The problem is that your Digital Picture Frame is only compatible with SD cards, not
SDHC cards. You bought a larger card for your Digital Picture Frame, not
noticing that it was SDHC (or not knowing that it mattered). The new
card doesn't work, not because it or the Digital Picture Frame is broken, but because
it's not compatible.

Cards up to 2Gb are generally SD.
Cards of 4Gb are generally SDHC.
Cards over 8Gb have to be SDHC.

(There are exceptions. Sometimes, manufacturers make 4Gb SDHC
cards but some have errors; they disable half of the chip and sell it
as 2Gb, but it's still SDHC. 4Gb cards are almost always SDHC because
they're cheaper, but 4Gb SD cards do exist. They are so rare that I've
even seen a guru on this site claim they don't. I did own one once, but
it was very expensive and turned out to be so unreliable that I had to
return it. I don't recommend
looking for one, because of the problems.)

Your solution is to go find a 2Gb card, and be extra sure that it
doesn't say "SDHC" on it.

i think you put it back again your 2GB micro chip, its not necessarily to put 8GB, it will not work.. Your sansa e250 is design for 2GB only, your not an inventor to do that... your only a user, if you something stupid on that, its your own risk but for me its not necessary, your not contented with that.. All you have to do buy a new one which a lot more than 2GB and up, right!... Don't be so pathetic to do that things, even the company don't want really to change even the micro chip inside.. They were not selling for that kind of MP3 player... if might be then they will loss profit on their product, youve been pirate on it... hope you understand the situation...

Start deleting pictures base on how good they are, importance and priority. Then by trial and error delete 50 pictures, download; 100 ... 200. Finally it download ... after 10-15 seconds wait. Total pictures deleted 1700 out of 4200. So there is a limitation on this type of camera with a 2GB chip, you have to stop taking pictures and change camerachip when the total count reach 2500 + or - 50 pictures.